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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member] | Treasury Stock [Member] | Series A Nonconvertible Preferred Stock [Member] Preferred Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2019 | $ 811,449 | $ 489 | $ 620,236 | $ 249,003 | $ (16,997) | $ (41,284) | $ 2
BALANCE (in shares) at Dec. 31, 2019 |  | 48,852,193 |  |  |  | 1,365,648 | 200,000
Net income | 38,155 |  |  | 38,155 |  |  |
Other comprehensive income | 2,460 |  |  |  | 2,460 |  |
Cash dividend | (7,098) |  |  | (7,098) |  |  |
Issuance of common stock to employees | 5,665 |  | 5,665 |  |  |  |
Issuance of common stock to employees (in shares) |  | 80,483 |  |  |  |  |
Shares withheld for employee taxes | $ (4,816) |  | (4,816) |  |  |  |
Shares withheld for employee taxes (in shares) |  | (30,437) |  |  |  |  |
Common shares repurchased (in shares) | 0 |  |  |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board | $ 554 |  | 554 |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares) |  | 5,678 |  |  |  |  |
Issuance of common stock to employees under an ESPP | 328 |  | 328 |  |  |  |
Issuance of common stock to employees under an ESPP (in shares) |  | 2,315 |  |  |  |  |
BALANCE at Mar. 31, 2020 | 846,697 | $ 489 | 621,967 | 280,060 | (14,537) | $ (41,284) | $ 2
BALANCE (in shares) at Mar. 31, 2020 |  | 48,910,232 |  |  |  | 1,365,648 | 200,000
BALANCE at Dec. 31, 2020 | 912,714 | $ 490 | 635,595 | 353,930 | (36,019) | $ (41,284) | $ 2
BALANCE (in shares) at Dec. 31, 2020 |  | 49,013,476 |  |  |  | 1,365,648 | 200,000
Net income | 51,687 |  |  | 51,687 |  |  |
Other comprehensive income | 1,010 |  |  |  | 1,010 |  |
Cash dividend | (9,487) |  |  | (9,487) |  |  |
Issuance of common stock to employees | 5,116 | $ 1 | 5,115 |  |  |  |
Issuance of common stock to employees (in shares) |  | 53,123 |  |  |  |  |
Shares withheld for employee taxes | $ (9,634) |  | (9,634) |  |  |  |
Shares withheld for employee taxes (in shares) |  | (22,048) |  |  |  |  |
Common shares repurchased (in shares) | 0 |  |  |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board | $ 630 |  | 630 |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares) |  | 4,443 |  |  |  |  |
Issuance of common stock to employees under an ESPP | 432 |  | 432 |  |  |  |
Issuance of common stock to employees under an ESPP (in shares) |  | 1,782 |  |  |  |  |
BALANCE at Mar. 31, 2021 | $ 952,468 | $ 491 | $ 632,138 | $ 396,130 | $ (35,009) | $ (41,284) | $ 2
BALANCE (in shares) at Mar. 31, 2021 |  | 49,050,776 |  |  |  | 1,365,648 | 200,000

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